

di 



MAN N^DT ATOMS OF THE ALBATROSS YOYAOKS, 293 



very evident radiiil arrangeiiu'iiL oi llic in-tworkj and, on the otlicr IuukK lln-re i« no 

 nu'nUon Ity liini iA llu- ajucal 8])uics. It is probable all these arc alike, in wliirh case 

 the name f^hould 1)0 Tvvjoniutn reticulu-iadluliun. It may l>e a<lded that my spec- 

 imens are larger lluui llu^ Grove and Start type, whicli is given as 0.002L' to 0.001 inch, 

 approximately (npial to O.OOSO lo 0.01 mm., whih,' my si)eciniens vary from 0.018 Lo 



O.lGium. 



Found at aiaiuni 102911, l\vvm^ Sea. 



Trigoniuni paralleluiu ( Khrenh.)''* ^Tann. 



AviphUdras paraUdaEhrvnh, Thy^. Abh. Akad. Wisri. IhTb 1839: 143. 184i?; 

 I^likrog. pi 19,/, 20a-h. IS51.? Kiitz. Hacill. 135. 1844. rrifrli. Hist. Infns. ed. 

 4. H58. 1S44. Dc Toni, Syll. Alg. 2: 908. ]894, 

 Trkcrathnn parnllehnn Ehrenl),?; Grev. Trant^. Mici. Soc. Lond. n. h. 13: 104. pL IL 



/ 



/ 



/. 22-2S. 1890. Schmidt, Atlas i>l. 75. f. 

 f, IS); pi Sl.f. 1-2. 1885, Van II cur. 

 . Grun. in Fen/d, liciK(; Novara IJot, 



1: 24. 1870. 



Trkeratinm ohLanum Flirenb. lU^r. Akad. Wiss.Jk^rb 1844: 88. 1845; ThyK. At^h, 

 Akad. Wiss. Berl. 1841: 425. 1843; Mikrog. pi JS, J, 4H-M^. 1S54. FriLch. 



Hist. Infus. ed. 4. 857. 18(iL 

 Nothoceraliuin! paraUehnn I)e Tnni, Syll. Alg. 2: 915. 1894. 



I have adopted the above t;pccilic name, a^ my .specimen agrees with (.;revillc's form. 

 Wht^ther or not tliia is A. parallehnn Elirenb. is im])ossiblc to (Ulcfmin(\ Ehrcnherg 

 simply says," under A, aniedihiviana, " Yor wcnig Tagen hat sich in d(*n griinhischen 

 Kreidemert^^eln noch eine zAV<4te Art dieser Galtung g(4unden, welche auf d(^n Seitcn- 

 flaclu'uparallelalleihen von Zcllen hat and dieals .1. ;)amiie?aal>/us(.n(h'rn ist.'' Kilt- 

 zing dimply repeats this meager mention. Ehrenberg'slignrep arc also inconclusive l)ut 

 show a very different center. All this Avoukl l)e simply negative excepl for the charac- 

 ter of T. ohUi6iiiH, which unmistakably is the same as Greville's T. pamJIchnn, the 

 figures of Ehrenberg, together with the diagnosis, making this plain, lie there says, 

 '^ * * * angtdislate rotnndatis, subtilissime pumlata. " If, therefore, Ehrenberg 

 haw twice named lIu^ same sp(H'ies, the earlier name, parallda, holds; if not, the proper 

 namf' for Grevillc'w form and my own is obiusuni. Though the chances are in favor of 

 the latter view, they are not conclusive, and tlu^ better-known iiame should remain. 



It is nut impossible to consider this species as tulonging to Stictodiscus, as f-as- 

 tracane^ suggests. But at least the form with which I have to deal is a little too div(T- 

 gent to a^ssign to that genus. I think the resemblance to Stictodiscus is largely in the 

 anastomosing shadow lines at the center of the valve, an ai>i>(^aranc(^ lacking in my 

 specimens. De Toni's placing the quadrate form in Ami)hitetras and the sextate in 



Nothoceratium is of course indefensible. 



A few l)ad errors in naming figures should liere be mentioned. Schnndt's Atlas, 

 plate 7(), figure 18, is nrtt T. paailldam, Init, asGrunow insists, 1\ j)fnmiaiseCM'\n\, Van 

 Heurck's Synopis, plat(^ 111, figure 1, has nothing to do witli this form; those in Wulle c 

 are so Ijad as tu luiv(^ no resemblance to ihis species, and his figures II, 12 are ])oor 

 copies of Schmidt's i>late 75, figures 11, 12, themselves dou])tlul examples of tliis 

 species. Van Ileurck's plate 111, figures 3 (certainly), 4, 5 (probaldy), are T. harrisoni- 



anum Norm. {^Slidodisais)A 



Found at station 301 311, near Hawaiian Islands. 



'iFhys. Abh. Akad. Wiss. Berl. 1839: M3. 1841. 

 ^Gastr. R<'p. Voy. (^halk Hot. 2: 114. 188G. 

 cWolh', Diat. N. A. pi 100. 1890. 

 ^Gf. Schmidt, Ailas pi 75, f, 15. 1882, 



